Have you guys that are hoping for a Biden nomination actually watched him very much? At least half of his answers at the last debate were gibberish. By "gibberish" I don't mean anything about their content, I mean that they were just nonsensical word salad. And it's not like he just had one bad night, that just seems to be where his brain is these days. That's not only a problem if he actually becomes President (but yeah, it's a huge problem in that scenario). I think it's a huge problem for his ability to beat Trump.
The story of the Biden campaign so far is that his numbers were high when nobody was paying attention, and they have steadily dropped as people have actually watched him. That doesn't concern you for the general election? Because people will be paying attention to that one.